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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 
     19 #define LOG_TAG "AudioDeviceCallback-JNI"
     20 
     21 #include <utils/Log.h>
     22 #include <nativehelper/JNIHelp.h>
     23 #include <nativehelper/JniConstants.h>
     24 #include "core_jni_helpers.h"
     25 #include <media/AudioSystem.h>
     26 
     27 #include "android_media_DeviceCallback.h"
     28 
     29 
     30 // ----------------------------------------------------------------------------
     31 
     32 using namespace android;
     33 
     34 JNIDeviceCallback::JNIDeviceCallback(JNIEnv* env, jobject thiz, jobject weak_thiz,
     35                                      jmethodID postEventFromNative)
     36 {
     37 
     38     // Hold onto the AudioTrack/AudioRecord class for use in calling the static method
     39     // that posts events to the application thread.
     40     jclass clazz = env->GetObjectClass(thiz);
     41     if (clazz == NULL) {
     42         return;
     43     }
     44     mClass = (jclass)env->NewGlobalRef(clazz);
     45 
     46     // We use a weak reference so the AudioTrack/AudioRecord object can be garbage collected.
     47     // The reference is only used as a proxy for callbacks.
     48     mObject  = env->NewGlobalRef(weak_thiz);
     49 
     50     mPostEventFromNative = postEventFromNative;
     51 }
     52 
     53 JNIDeviceCallback::~JNIDeviceCallback()
     54 {
     55     // remove global references
     56     JNIEnv *env = AndroidRuntime::getJNIEnv();
     57     if (env == NULL) {
     58         return;
     59     }
     60     env->DeleteGlobalRef(mObject);
     61     env->DeleteGlobalRef(mClass);
     62 }
     63 
     64 void JNIDeviceCallback::onAudioDeviceUpdate(audio_io_handle_t audioIo,
     65                                             audio_port_handle_t deviceId)
     66 {
     67     JNIEnv *env = AndroidRuntime::getJNIEnv();
     68     if (env == NULL) {
     69         return;
     70     }
     71 
     72     ALOGV("%s audioIo %d deviceId %d", __FUNCTION__, audioIo, deviceId);
     73     env->CallStaticVoidMethod(mClass,
     74                               mPostEventFromNative,
     75                               mObject,
     76                               AUDIO_NATIVE_EVENT_ROUTING_CHANGE, deviceId, 0, NULL);
     77     if (env->ExceptionCheck()) {
     78         ALOGW("An exception occurred while notifying an event.");
     79         env->ExceptionClear();
     80     }
     81 }
     82 
     83